docs: UI-audit fixes in CLAUDE.md, API, OpenAPI, LANES and READMEs

New params and errors (agents session_ids, sessions awaiting/from/to,
stats tool counts, event labels, cleanup dry_run/INVALID_PURGE_DAYS, lane
start slot auto/ESESSIONLIVE/EUNSUPPORTED), terminal and pane shortcuts,
the shared UI primitives, accent vs accent-solid, lazy routes and the
Settings groups. openapi.yaml regenerated.

README.md

@@ -64,8 +64,9 @@ Internal build — all rights reserved.
   Instructions, Memory, Context files and extra Folders, which Claude and Codex
   sessions start with.
 - **Settings as one page per section** (`/settings/<section>`): a left nav
-  grouped General / Agents / Routing / Git, a search box (Ctrl+F) over every
-  section, a page per installed AI tool, per-vendor model pricing, and which
+  grouped General (General / Data / About / Appearance / Pet / Notifications) /
+  Agents / Routing / Cost / Git, a search box (Ctrl+F) over every section whose
+  results deep-link a row's sub-tab and anchor, a page per installed AI tool, per-vendor model pricing, and which
   untracked worktrees a workspace's Add folder suggests.
 - **Claude Code + Codex configuration explorer.** Settings hosts one page per
   tool: every plugin, skill, subagent, slash command, MCP server, hook, settings